Malicious PDF — malware analysis report

Static analysis result for SHA-256 90243547fc00951b…

MALICIOUS

PDF

80.1 KB Created: 2021-09-16 18:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 42b070bf2932b3a09edd7b2610b2a467 SHA-1: ba9503dc3cdf38167132ff9423843dc1f655ac52 SHA-256: 90243547fc00951b8eb42f42ee3824375c25d31a427b515395d0aff216518466
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics strongly suggest the PDF is designed to trick users into downloading further malware or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://plncse.hu/php_data/file/55431503338.pdf In PDF document text
    • https://branchennachweis.eu/userfiles/file/79308821668.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/fizazijejurozakej.pdfIn PDF document text
    • https://gangnampools.com/contents/files/76314960588.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/wederikuro.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7a2232b12---85782936157.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/9a774a2b8b766c05c14ac0ba777aef63/65992134207.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614071863b232---lijezudugijuf.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/gowekidugokijabeza.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/puwomazosevowogeranat.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/kuxazadurosuvavim.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138aa8d70bf4---94007056187.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/73231616008.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/91152d39be610b04a97f853d2ec11d3f/norud.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/60133229635.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/56877215028.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/47781808064.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/33472674293.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210909131024.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/wugabogomazam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=words+with+friends+2+mod+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD248 18020 bytes
SHA-256: 0e09df69b3d9726044621bc872d156067befe84388bb2e6b322f16743046b2cf
font_01_sfnt_off00010158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10158 11008 bytes
SHA-256: 5c338c7baf69cb453681e0f9f72b87b7b1c6d3a71eea626e27113b81662352f7
font_02_sfnt_off00011ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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